Adolescents (both male and female) in the ages 13 to 16, who go to secondary school and have got a diagnosis of ADHD (combined subtype or predominantly Inattentive subtype). Also the participating adolescents have an IQ higher than 80 and need to have significant problems with planning and organizing.

Cognitive-behavioral therapy vs. therapy as usual.
Both therapies are weekly interventions that will take one hour for the duration of 8 weeks.

- Primary outcome

1. Symptoms of ADHD will be measured using the Disruptive Behavior Disorders Rating Scale and the Child Behavior Checklist and Youth Self Report;
2. Executive functioning will be measured using the Behavioral Rating Inventory of Executive Functioning (BRIEF), D-KEFS Tower task, Behavioral Assessment of the Dysexecutive Syndrome (BADS) and the Trail Making Test.

- Secondary outcome

1. Parental stress will be measured using the Parental Stress Index;
2. Schoolfunctioning will be monitored by teachers of the adolescents using the first part of the Teacher Report Form;
3. Adolescents attitude towards school will be measured using the School Attitude Questionnaire Internet (SAQI);
4. Selective attention will be measured using the Flanker taak;
5. Working memory will be measured using the N-back task;
6. The adolescents sensitivity to reward and punishment will be measured using the bis/bas scales.

- Timepoints

Just before therapy, directly after therapy, 3 months and 1 year after therapy.

This study aims to investigate the effect of cognitive-behavioral therapy on the planning and organizational skills of adolescents with ADHD using a randomized clinical trial.

- Main changes (audit trail)

26-Apr-2013: Changed secondary outcomes - NM
1. Parental stress will be measured using the Parental Stress Index; changed to Conflict Behavior Questionnaire;
2. Schoolfunctioning will be monitored by teachers of the adolescents using the first part of the Teacher Report Form; changed to Homework Problems Checklist and Classroom Performance Scale;
3. Adolescents attitude towards school will be measured using the School Attitude Questionnaire Internet (SAQI);
4. Selective attention will be measured using the Flanker taak; removed as outcome;
5. Working memory will be measured using the N-back task; removed;
6. The adolescents sensitivity to reward and punishment will be measured using the bis/bas scales. Removed as outcome.
Added:
4. Internalizing comorbidity will be measured with the Child Depression Inventory and the SCARED.
Primary outcome: Youth Self Report; removed.